Apparatus for pasteurizing milk.



H. PELDMEIER & O. B. DALZELL. APPARATUS FORPASTEURIZING MILK.

APPLICATION TILED AUG, 23, 1909.

1 7 5 1 3 Patented July 15, 1913.

2 SHEETSSHEET 1. \Q

mmmmmm H. FELDMBIER (SEC. B. DALZBLL.

APPARATUS FOR PASTE-\IRIZING MILK.

: APPLIGATION FILED AUG. 23, 1909.

Patented Jul 15, 1913 2 SHEETS-SHBET2.

INK/622 55719.

tion 28 through which ice water a section 29 for brine.

F represents a storage tank or rat which receives the pasteurized mill;by a pipe 30 and in which the milk is stored until it is bottled orotherwise disposed of.

In the operation of thi apparatus the I cold milk having a temperatureotabout 60 degrees F. is first deodorized, aerated and partially heatedin flowing in a film or thin sheetover the, coil 13 of the regeneratingpreliminary heater and aerator B. In starting the operation the coil ofthis heater is supplied with hot water through a pipe 31, but when thehot milk begins tohow from the holder 1) the hot water is cut oil andthe hot milk is directed to the coil. The cold milk is heated by thepreliminary heater to a temperature of about 120 degrees F. and is thenfurther heated in passing through the final heater G to the requiredhigher temperature, usually from M0 to 150 degrees F. This temperatureis practically maintained while the milk flows through the holder, themilk losing in tern-- perature but a few degrees as theholder is flowsand suitably insulated or protected against loss of heat. The hot milkoccupies a suliicient length of tine in flowing through the holder tosubject the milk thoi oughly to the action of the heat, the period beinginversely proportionate to the degree oi' heat which is imparted to themilk, since with aoomparatively high temperature a proportionatelyshorter period of time is sullicient for -rendering most of the bacteriainnocuous. For illustration, with a temperature of 140 degrees impartedto he milk a holding period of thirty minutes '5 suitable, while with atemperature of 150 degrees F. a period of twenty-live minutes would besutlicient. If the hot milkenters the holder with a tem perature ofabout lelO degrees F. it will leave the he .der with a temperature ofabout 138 degrees F., and reach the preliminary heater 13 with atemperature of about i358 degrees F. In passing upwardly thr ugh. thecoil ot this heater the milk parts v th a considerable portion of thisheat by transt'erring the same to the cold mill-i which passes upon thisheater with a temperature of about 60 degrees F. and leaves the samewith a temperature of about 120 degrees F., while the hot milk escapesfrom the upper endot-thecoil with a temperature of about 90 degrees F.The system is regenerative in that a portion of the heat contained inthe hot milk is transferredto the incoming 'cold milk, whereby the hotmilk is pa 'tially. cooled before it is subjected to the final cool in roperation in the cooler E by which the mi k is cooled to about 40degrees F. An important economy in heat is thereby efleeted. The milkrea ies the na eater with a temperature of about 120 de rees F.,

.tiall y is heated by this heater to a temperature of -i'rom 140 to 150degrees F., as may be desired, and this temperature is practicallymaintained while the milk flows through the holder. The milk is keptconstantly in motion while it is operated upon, whereby a partialseparation of the cream, which is liable to take place when the milk isallowed to come to, a state of rest, also a coating of the pipes orpassages, is avoided, while the milk is thoroughly and uniformly actedupon by the heating and cooling agents.

In the operation of this process the milk is first heated in a film orthin sheet, While exposed to the air, whereby objectionable odors,vapors and gases are driven olt' and the milk is then heated andcooledwhile confined in closed passages, whereby the milk is preventedfrom absorbing again odors, vapors, germs or bacteria from thesurrounding air, and these operations are carried on while the milk iskept constantly in motion, thereby preventing a partial separation ofcream and an objectionable coating of the pipes or passages, which areliable to occur when the milk is allowed to come to a state of rest,thus insuring a uniform, thorough and et'ective pasteurization.

In referring herein to milkwe intend to include also milkderivatives,for instance, Cream, skimmilk, buttermilk, 8pc.

We claim as our invention:

1. In a pasteurizing apparatus, the combination ot means for heating themilk to the pasteurizing temperature, a holder for the heated milkprovided with substantially horizontal sinuous flow channels throughwhich the heated milk flows in a continuous stream while practicallymaintaining the pasteurizing temperature for the required length oftime, and a cooler through which the milk flows after having beensubjected to the pasteurizing temperature in the holder, substantiallyas set forth.

:2. In a pasteurizing apparatus, the combination of means for heatingthe milk to the pasteurizin temperature, a holder for the heated mi kprovided with substanhori'zontal sinuous flow channels through, whichthe heated milk flows in a continuous stream while practicallymainholder-tor the heated milk provided with substantially horizontalsinuous fiow channels through which the heated milk flows in l a.continuous stream while practically mainbeen subjected to thepasteurizing temperature in the holder, substantially as set forth.

Witness our hands in the presence of two subscribing witnesses.

HARVEY FELDMEIER. CHARLES B. DALZELL. Witnesses:

GRIFFITH PRIQHARD, W. T. WOLFENDEN.

